- A Prolonged nutrient starvation activating the stringent response
- B DNA damage (RecA coprotease activity)
- C Exposure to high temperature alone, triggering heat-shock proteins
- D Osmotic stress activating compatible solute accumulation pathways
Correct answer: B. DNA damage (RecA coprotease activity)
Explanation: SOS response: DNA damage causes RecA to become activated as a coprotease. It cleaves LexA repressor, inducing DNA repair genes including RecA, UvrA, and error-prone polymerases.
Concept context
Mendel's laws, inheritance patterns, DNA structure, and molecular biology. Core of NEET biology.
Read the full Principles of Inheritance and Variation notes →